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foolproof

[fool-proof] /ˈfulˌpruf/
adjective
1.
involving no risk or harm, even when tampered with.
2.
never-failing:
a foolproof method.
Origin of foolproof
1900-1905
1900-05, Americanism; fool1 + -proof
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for foolproof

foolproof

/ˈfuːlˌpruːf/
adjective
1.
proof against failure; infallible: a foolproof idea
2.
(esp of machines) proof against human misuse, error, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for foolproof
adj.

also fool-proof, 1902, American English, "safe against the incompetence of a fool," from fool (n.) + proof.

Online Etymology Dictionary, © 2010 Douglas Harper
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